JOURNAL OF NATURAL RESOURCES ›› 2017, Vol. 32 ›› Issue (1): 137-151.doi: 10.11849/zrzyxb.20160166

• Resource Evaluation • Previous Articles     Next Articles

The Spatial and Temporal Distribution of Drought in Shaanxi Province

REN Yi, WANG Yi-min, CHANG Jian-xia, HUANG Qiang   

  1. State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi’an University of Technology, Xi’an 710048, China
  • Received:2016-02-24 Online:2017-01-15 Published:2017-01-15
  • Supported by:
    Scientific Research Funds of Water Conservancy Project Special Public Welfare Industry, No. 201501058; Water Conservancy Science and Technology Plan Projects of Shaanxi Province, No. 2013slkj-09.

Abstract: At present, most of the drought researches are based on a single meteorological or hydrologic drought index which can not reflect the drought situation or social contradiction of supply and demand of water comprehensively. This paper studied the spatial and temporal distribution of drought in Shaanxi Province based on the method taking the social economic factors of drought into account. The natural meteorological factors are also taking into consideration. We established comprehensive drought evaluation index of Shaanxi Province with fuzzy comprehensive decision process on basis of meteorological data from 19 meteorological stations in Shaanxi from 1960 to 2013. The results showed that the spatial distribution of drought in Shaanxi Province is heterogeneous, the drought in the central Shaanxi (DI value is about 3) is more serious than in northern Shaanxi, and there is no drought in south Shaanxi at the same time where water resources are abundant. Drought occurrence frequency in Shaanxi Province is very high. The medium drought phenomenon mostly existed in the north and south (frequency approached to 80%-99.99%). The severe droughts occurred in the central Shaanxi more often (frequency approached to 79%). The method of water supply and demand evaluation considered the influence of social economy and the actual supply and demand contradiction. And the comprehensive meteorological drought index considered the effects of meteorological factors. The results of the two methods are basically identical, but only one type of drought index can not reflect the overall actual situation when there exists great difference of water quantity in different areas. In water shortage regions, the results of fuzzy comprehensive drought index are closer to the fact. In regions where water resource is extremely rich and water supply ability is strong, the results of water supply and demand method are closer to the fact. And in economic developed areas, social economy drought index is suggested. When doing researches of drought, it shall give full consideration to the natural meteorological factors and actual water supply ability.

Key words: comprehensive drought index fghgfhgfnhfghgfh, drought, supply and demand balance of water resources, Shaanxi Province

CLC Number: 

  • P426.616